Bag



W. E. SCOTT Nov. 14, 1939.,

BAG

Filed Aug. ll, 1938 ATT Patented Nov. 14, 1.939

UNITED STATES PATENT OFFICE BAG of Delaware Application August 11, 1938,Serial No. 224,241

5 Claims.

This invention relates to improvements in the construction of bagseither of the open mouth or valve type, preferably, but not necessarilyprovided with gussets, and more particularly to the construction ofmulti-ply bags. The bag constituting the subject matter of the presentinvention relates specifically to details of construction whereby greasyor oily materials may be successfully packaged.

Essentially the primary object of the invention is to so relate thevarious plies makingup the bag that oily and greasy substances as, forexample, shredded cocoanut, peanuts, etc. may be successfully packaged.Another object of this invention is to so construct a bag of the typeabove described in such a manner that the appearance of the bag is notaltered.

Paper bags appeal strongly to customers who have heretofore relied uponbags made of coarse textiles and one of the major reasons that largepaper bags have become commercially successful is that they present asmooth exterior upon which fine print and appealing designs may becarried. An advantage of the present invention lies in the preservationof this smooth unbroken exterior.

These and other objects of the present invention become more apparentfrom a reading of the following description taken in connection with theaccompanying drawing in which Fig. 1 is a side elevation of a multi-plybag constructed in accordance with the principles of the invention,certain parts being broken away to show the relationship of the variousplies of the different materials making up the bag walls, and

Fig. 2 is an enlarged sectional View of a portion of the bag showing inmore particularity certain details of construction.

Referring now more particularly to the drawing, in which like numeralsindicate like parts, there is shown a multi-ply shipping bag providedwith the usual gussets I0 and bottom- I I The bottom of the bag isclosed by a closure extending through the gussets and which ispreferably a line of stitches, or which may be staples or other closingmeans indicated by the numeral I2. Preferably the bag is provided with astrip I3 of adherent material, such as gummed crepe paper, folded overthe end of the bag to prevent sifting of materials through the stitchesor through the stitch holes and also to protect the stitches andpreserve the uniformity and the appearance of the bag. Other forms ofend closures may be used since the invention does not reside in the agedcontents.

specific formof closure. A bottom of the satchel type may be used.

The bag is usually formed from a plurality of nested tubular plies ofmaterial and, in the embodiment shown, the inner ply I4 of the bagcomprises two sheets of glassine paper laminated together by means ofwax, rubber or the like so that in the event of undue tension a slightrelative movement of the two layers may take place without rupture toeither layer. In order to render paper sufficiently pliable it may beplasticized in any suitable manner. 'Ihe binder used also increases themoisture and grease resistant characteristics of the laminated ply.

It will be appreciated that any suitable sheeted material possessing thedesired grease resistant and moistureproof characteristics or either ofthese characteristics may be used. Glassine, however, is readilyavailable commercially at comparatively low cost and, therefore, is tobe preferred.

'I'he next two plies I5 and I6 comprise kraft paper of suitable basisweight. For the packaging of shredded cocoanut, in particular, these twoplies are formed usually of 40# basis weight paper. In order to protectthe inner glassine laminated ply from outside moisture conditions anasphalt laminated ply I'I is used. The paper used comprises two sheetsof kraft paper of approximately 30# basis weight laminated together inany suitable manner by means of asphalt or the like I1'. The plies I5and I6 of kraft paper lying between the asphalt laminated ply I1 and theglassine laminated ply I4 serve not only to give the desired strength tothe bag, but serve to prevent any possible contamination of the glassineply by the asphalt. Hence any deleterious effect on the packagedcommodity from outside moisture conditions -is avoided. At the sametime, the glassine laminated ply will serve to prevent the strikingthrough of grease or other oily material and destroy the effectivenessof the moistureproof asphalt laminated ply. Accordingly, the outer plynever assumes a mottled or streaky appearance due to grease or otheroily material because of the presence of both the glassine laminated plyand the asphalt laminated ply. As will be appreciated, in hot weather itis likely that the asphalt would strike through the glassine ply if itwere in contact therewith because of the comparative thinness of theglassine, thereby contaminating the pack- `The glassine innermost plymay be, if desired, of a color.' t'o accentuate the `whiteness of thepackaged commodity and, in many cases, will serve to reduce the effectof certain harmful rays on the commodity. Instead of using kraft paperin the construction of the asphalt laminated ply, the material known asSisal kraft or similar material may be used. The Sisal kraft is ofparticular advantage where it is desired to increase the resistance ofthe bag against tearing, puncturing, or snag'ging which would result ina deterioration 'or contamination of the material packed.

The outermost ply Il is made of kraft paper of a higher basis weightthan that used in forming the intermediate kraft plies so as to give thebag greater abrasion resistance. This outer sheet adds considerablestrength to' the bag and since it is inherently water resistant tends toprevent moisture from penetrating into the bag with the possibility ofdestroying or :herring the remaining plies of the bag. It is notaffected to any appreciable extent by the asphalt of the asphaltlaminated ply. l

A bag constructed as described above provides a suitable container forthe packaging of all types of greasy and oily materials. Although theconstruction of the bag has been described particularly with referenceto the packaging of shredded cocoanut, it will be obvious to thoseskilled in the packaging art that a bag so constructed may also be usedfor the packaging of all types of greasy and oily materials.

The description of the bag hasr been with the .view of packagingshredded cocoanut. However,

certain plies of the bag might be omitted depending upon the particularingredient packaged and determined in part upon the usage to which thecontainer when filled will be subjected. For example, in the packagingof materials which will not encounter water shipment conditions or whichwill be at all times kept under cover, the necessity for the use of anasphalt laminated'ply becomes less important and although not absolutelyessential it is still desirable for the reason that the packagedcommodities will still be protected should the package be accidentlysubjected to moisture.

Other similar modiflcationsln form` and arrangement will readily suggestthemselves to those skilled in the art 'and We d0 not intend to belimited to the exact details set forth herewith, but the scope of theinvention is to be determined by the following claims which are to bebroadly construed.

I claim:

1. In a multi-'ply bag structure for the packaging of greasy materialsandthelike, comprising, in combination, an inner ply comprising twosheets of glassine laminated together with a nonsetting adhesive, a plycomprising two sheets of kraft paper laminated together with asphalt, atleast one ply of kraft paper interposed between and separating saidlaminated plies, and an outer sheet of kraft paper enveloping saidasphalt laminated ply and providing a printing surface for identifyingindicia and advertising matter.

2. In a multi-ply bag structure for the packaging of greasy materialsand the like, comprising, in combination, an inner ply comprising twosheets of grease-proof material laminated together with a non-settingadhesive, a ply con-- prising two sheets of kraft paper laminatedtogether .with asphalt, at least one ply vof kraft paper interposedbetween and separating said laminated plies, and an outer sheet of kraftpaper enveloping said asphalt laminated ply and providing a printingsurface for identifying indicia and advertising matter.

3. In a multi-ply bag structure for the packaging of greasy materialsand the like, comprising, in combination, an inner ply of laminatedgrease-proof material, a ply of laminated Sisal kraft, at least one plyof kraft paper interposed between and separating said ply oi' laminatedgrease-proof material and said ply of-laminated Sisal kraft, and anouter ply of kraft enveloping said ply of laminated Sisal kraft andproviding a printing surface for identifying indicia and advertisingmatter.

4. A package for shredded cocoanuts comprising an inner ply of laminatedglassine with which the shredded cocoanut is in contact, a ply oflaminated Sisal kraft, at least one ply of kraft paper interposedbetween and separating said ply of laminated glassine and said ply oflaminated Sisal kraft, and an outer ply of kraft enveloping said ply oflaminated Sisal kraft and providing a printing surface for identifyingindicia and advertising matter.

5. A multi-ply bag structure for the packaging of greasy comestibles forocean shipment comprising, in combination, an inner ply oif grease-proofsheet material incapable of affecting foods, a ply of asphalt laminatedpaper, at least one ply of paper interposed between and separating saidply of grease-proof sheet material and said ply of asphalt laminatedpaper, and an outer ply of paper enveloping said first mentioned pliesand providing a printing surface for identifying indicia and advertisingmatter.

WILLIAM EDWARD SCOTT.

